So I've been hooking up with my ex-stepbrother for 20 years now. We started when we were 15. I would just fool around with him. He would ask me for a blowjob, and it was just innocent things, and then it just suddenly progressed to, like, more things, and... We've never really wanted to fully hook up and make it official, because we're clearly step-siblings, but... He's, like, the best ex I've ever had, and I don't know what to do, and who knows? It's kind of cool, because we can keep it a secret. I still see him, like, four or five times a year. What should I do?